Paço de Arcos (European Portuguese pronunciation: [ˈpasu ð(i) ˈaɾkuʃ]) is a locality of Oeiras.
Its name comes from the Palácio dos Arcos located at the entrance to the village, where king D. Manuel I of Portugal watched Vasco da Gama's caravels leave for India.
Paço de Arcos is where Quinta da Fonte is located, one of the biggest office parks in Europe, being the home of companies such as DLL Group, Hewlett-Packard, among others.
The town is featured in Robert Wilson's 1999 novel A Small Death in Lisbon, as both the residence of the main character, Inspector José "Zé" Coelho, and where a body is found.
Items of interest in the locality include Lime kilns (Portuguese: Fornos de Cal) dating back to the Middle Ages.